cor thermostat TSTATECM2W01, Installation Instructions Manual

Page: 12 / 40

11
TROUBLESHOOTING
If the display doesn’t power up after power is applied, check the Rc/Rh and C
terminals for 24VAC. If 24VAC is present, check the voltage between Vg and V+.
This voltage will be approximately 12 − 20VDC. If voltage is present, check the
polarity to make sure it is wired correctly. The display will not power up if polarity
is reversed.
Error Codes
Comm Error − If the Côr 7 Series Thermostat and the Two − Wire Relay Module
cannot communicate via two − wire connection, an Comm Error will be displayed.
HW Failure − If Côr 7 Series Thermostat’s internal memory fails, HW Failure will
be displayed. Replace Thermostat.
Invalid HUM − If Côr 7 Series Thermostat cannot properly read humidity, Invalid
HUM will be displayed. Replace Côr 7 Series Thermostat. If both Humidify and
Dehumidify have been set to OFF, the humidity value will not be shown on the
screen when cycling through the info button.
Table 4 can be used as a troubleshooting tool for determining which outputs will be
active for a particular configuration and each operating mode.